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A B
1 200 pA
RMP RMP
mV
20
100 ms
Con Pir⁃KA
C D E
50 Con 150 -50 ***
Pir⁃KA
( Hz ) 40 * ( mV ) 100 * ( mV ) -60
30
频率 20 电位 50 RMP -70
10 -80
0 0 -90
0 50 100 150 Con Pir⁃KA Con Pir⁃KA
Current step(pA)
A:膜片钳技术记录梨状皮层细胞的示意图(×60);B:在电流刺激下记录的梨状皮层代表性放电图;C:不同电流刺激下记录的梨状皮层神经元
放电频率统计图;D:动作电位幅值的统计图;E:静息膜电位的统计图。两组比较,P < 0.05, P < 0.001(n=4,Con cell=13,Pir⁃KA cell=17)。
*
***
图4 梨状皮层脑立体定位注射KA后神经元兴奋性增加
Figure 4 Increased neuronal excitability after stereotactic injection of KA into piriform cortex
本研究显示在梨状皮层脑区注射KA可以产生 al. Hepatocyte growth factor attenuates the severity of sta⁃
癫痫样放电,放电频率增加,静息膜电位降低,这表示 tus epilepticus in kainic acid⁃induced model of temporal
梨状皮层注射KA后神经元更容易兴奋。Joshi等 [24] lobe epilepsy by targeting apoptosis and astrogliosis[J].
研究也表明,KA腹腔注射诱导的急性癫痫模型中会 Basic Clin Neurosci,2021,12(6):805-816
[6] CUTIA C A,LEVERTON L K,GE X,et al. Phenotypic
[24]
引起梨状皮层明显的脑电改变 ,与本研究一致。
differences based on lateralization of intrahippocampal
本研究结果显示,小鼠梨状皮层注射KA 0.2 μg
kainic acid injection in female mice[J]. Exp Neurol,
后,结合癫痫评分、行为学和电生理结果,该模型均
2022,355:114118
符合癫痫模型特征。相比海马注射KA的癫痫模型 [7] BAHN S,VOLK B,WISDEN W. Kainate receptor gene ex⁃
来说,癫痫发作潜伏期更短。综上,梨状皮层注射 pression in the developing rat brain[J]. J Neurosci,1994,
KA 0.2 μg的小鼠模型可作为新癫痫模型。 14(9):5525-5547
[8] BEN⁃ARI Y,COSSART R. Kainate,a double agent that
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